R. David Murray added the comment:

In t2, you assign to num.  That makes it local.  In t1, you don't, so num is 
picked up from the global scope.

----------
nosy: +r.david.murray
resolution:  -> invalid
stage:  -> committed/rejected
status: open -> closed

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue15621>
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